Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. Westinghouse WD43UB4530 and TCL 40S355-CA are well-equipped smart TVs that aim to provide a balance of picture quality, performance, and smart capabilities. Overall, both models are capable choices in their segment, offering a balance between performance, features, and usability. Westinghouse WD43UB4530 and TCL 40S355-CA differ in resolution (4K 3840 x 2160 vs 1920 x 1080), which can affect overall clarity and sharpness of the display. Both TVs come with smart platforms that support popular streaming apps and voice control features. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. There is a difference in screen size (43 Inch (109.22 cm) vs 40 Inch (102 cm)), and a larger screen generally provides a more immersive viewing experience.

Verdict: Both TVs are strong contenders, and your final choice should depend on your preference for screen size, motion performance, and smart features.